T47a (asymmetrical) threaded BB cups for T47a frames and 29mm diameter spindle compatible cranks. Cups have internal bearings, and can be used in BB shells with widths from 77.5 – 79mm. Machined aluminum cups thread together directly into a Cervelo, Factor and Felt T47a BB shell.
• T47 external cup on the drive side
• T47 internal cup on the non-drive side
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